Abstract
Coordination polymerization of isoprene in the presence of Ziegler–Natta catalytic systems based on a mixture of neodymium and gadolinium bis(2-ethylhexyl) phosphates at the neodymium/gadolinium molar ratios of 25/75, 50/50, and 75/25 was studied. These catalytic systems exhibit high catalytic activity in isoprene polymerization, equal to that of the catalytic system based on neodymium bis(2-ethylhexyl) phosphate. The influence of the Nd/Gd ratio on the molecular-mass characteristics and microstructure of the polymers obtained was examined. The kinetic parameters of the isoprene polymerization using catalytic systems based on a mixture of neodymium and gadolinium salts were determined. The possibility of using such systems in the synthesis of stereoregular cis-1,4-polyisoprene with the optimum level of molecular masses was demonstrated.
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ACKNOWLEDGMENTS
The authors are grateful to staff members of the Lebedev Research Institute of Synthetic Rubber: to Senior Researcher L.V. Agibalova and Senior Researcher E.Yu. Maretina for the assistance in studying the molecular-mass characteristics of polyisoprene and to L.V. Osetrova for studying the microstructure of the polymer samples by NMR spectroscopy.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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E.S. Novikova and E.I. Levkovskaya: synthesis of catalytic systems, isoprene polymerization, processing and interpretation of the experimental data; E.E. Senderskaya: analysis of data on the microstructure and molecular characteristics of the polyisoprenes obtained; G.G. Chernyavskii: participation in task setting and in interpretation of the results of isoprene polymerization; T.S. Belorukova: synthesis of neodymium and gadolinium bis(2-ethylhexyl) phosphates, analysis of the starting components of the catalytic systems, participation in generalization of the results.
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Translated from Zhurnal Prikladnoi Khimii, No. 2, pp. 177–183, February, 2023 https://doi.org/10.31857/S0044461823020068
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Novikova, E.S., Levkovskaya, E.I., Senderskaya, E.E. et al. Isoprene Polymerization in the Presence of Phosphate Catalytic Systems Based on a Mixture of Neodymium and Gadolinium Salts. Russ J Appl Chem 96, 169–175 (2023). https://doi.org/10.1134/S1070427223020077
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DOI: https://doi.org/10.1134/S1070427223020077